Malicious PDF — malware analysis report

Static analysis result for SHA-256 94523b13b94067fc…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 04:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9c0ff9916e3d59dfe5782496c23b3fa9 SHA-1: cd33abf1ba138aed4008d67c66286fda81a0d46c SHA-256: 94523b13b94067fcc363633ccfa897b948c9da1cd7da4cdf459b864e1096d7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://niezapominajkowo.eu/userfiles/file/40310722921.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/aafq0dd45gvh044s8onhac2iv4/fegerezebuwogoparexixafe.pdfIn PDF document text
    • https://efnnma.org/files/file/desezanisoj.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/40232911864.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0077f236e1---bimazutidememu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/35768802945.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0f278a5f8---rogixidirixugox.pdfIn PDF document text
    • http://cityfate.com/files/files/biboburazesozagumufile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081817e95258---sipizikif.pdfIn PDF document text
    • http://maihome.hu/admin1/file/14038712980.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/94715003792.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b555f31240c6a04a7b35ce960de742ad/dilovexolidiruta.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/setexitove.pdfIn PDF document text
    • https://forssh.com/userfiles/file/1194592732.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/721b0a999c0b6c789741cd29d0dc81cb/3290984316.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/tilarura.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210801161305.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cb629997a6eeb352dbb744d9bbffc806/pedinotokij.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a0479e2---52872324442.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/99394116237.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/294bd75c441e92ee502f32c134d6e64b/17333903422.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081119618819---85475624204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kant+critique+of+the+power+of+judgment+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 18716 bytes
SHA-256: 6421b4feae3ecff1302aed8114b31ad6a3546e57c24c2048b08538b70f7e2ebb
font_01_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14705 11304 bytes
SHA-256: e9b4372dc2a5f7e9270e3371f216d31c392fe04c4c89c52e9863aad6c758a827

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